two singles used alongside 2c Brown Banknote (146), tied by NYFM grids (Weiss TR-G22) to 1877 cover to Paris, France at the 10c rate (4c overpaid), red "New York Paid 6 May 6" exchange datestamp, endorsed "Via England" and with red London transit, Calais May 18 entry handstamp, very fine, the only recorded example of this NYFM cancel, illustrated in Weiss (page 333), ex-Ainsworth